Hey Bobi :-) .
I solved the problem by editing each thumnail : edit/custom preview/ then I browsed the web in search of a good thumbnail (best is go to main website and find the logo). Then refresh preview and done !
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Hey Bobi :-) .
I solved the problem by editing each thumnail : edit/custom preview/ then I browsed the web in search of a good thumbnail (best is go to main website and find the logo). Then refresh preview and done !